Eddy current sensor for a rotary shaft and rotary shaft apparatus

Patent metadata

Field	Value
Publication number	US-10466265-B2
Application number	US-201515539791-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Feb 12, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

An eddy current sensor for a rotary shaft and a rotary shaft apparatus. The eddy current sensor includes: a housing; one or more position detecting probes provided on the housing; and a rotating speed detecting probe provided on the housing. The eddy current sensor integrates the position detecting probe and the rotary speed detecting probe, such that while the eddy current sensor is detecting position displacement of the rotary shaft, the eddy current sensor may also simultaneously detect the rotating speed of the rotary shaft, which facilitates detecting and monitoring the rotary shaft more comprehensively. The detected position data and rotating speed data of the rotary shaft correspond to each other at any time, such that the working state of the rotary shaft may be analyzed more intensively.

First claim

The invention claimed is:

1. An eddy current sensor for a rotary shaft, comprising:
a housing;
one or more position detecting probes provided on the housing;
a rotating speed detecting probe provided on the housing; and
a filler element filling interstices within the housing to form a solid annular cylindrical body, such that the position detecting probes and the rotating speed detecting probe are plastically sealed together with the housing;
wherein the housing comprises:
an inner ring portion, a center of which forms a central hole for the rotary shaft to pass through;
a middle portion connected to an exterior wall of the inner ring portion and extending outwardly;
an outer ring portion connected to an end away from the inner ring of the middle portion and forming a recessed structure with the inner ring portion and the middle portion;
wherein the position detecting probes being provided on the inner ring portion and/or the middle portion, the rotating speed detecting probe being provided on the inner ring portion or the outer ring portion.

2. The eddy current sensor for a rotary shaft according to claim 1 , wherein the housing comprises a central hole for the rotary shaft to pass through, a detecting end of the rotating speed detecting probe being oriented parallel or perpendicular to an axial direction of the central hole.

3. The eddy current sensor for a rotary shaft according to claim 1 , wherein the rotating speed detecting probe is provided on the inner ring portion, and wherein a detecting end of the rotating speed detection probe is oriented perpendicular to an axial direction of the central hole.

4. The eddy current sensor for a rotary shaft according to claim 1 , wherein the rotating speed detecting probe being provided on the outer ring portion, and a detecting end of the rotating speed detecting probe being oriented parallel to an axial direction of the central hole.

5. The eddy current sensor for a rotary shaft according to claim 4 , wherein the outer ring portion is opened with a mounting hole for mounting the rotating speed detecting probe, and a detecting end of the rotating speed detecting probe is flush with an end of the housing.

6. The eddy current sensor for a rotary shaft according to claim 1 , wherein on a peripheral direction of the housing, a length of an arc between the rotating speed detection probe and a position detecting probe adjacent to a left side of the rotating speed detecting probe is equal to that of an arc between the rotating speed detecting probe and a position detecting probe adjacent to a right side of the rotating speed detecting probe.

7. The eddy current sensor for a rotary shaft according to claim 1 , wherein the one or more position detecting probes include one or more radial probes that are provided on the inner ring portion, and wherein detecting ends of the one or more radial probes are oriented perpendicular to an axial direction of the central hole, the radial probes are configured to determine a radial distance between an outer surface of the rotary shaft and the radial probes.

8. The eddy current sensor for a rotary shaft according to claim 7 , wherein the outer ring portion is provided with one or more radial holes being in a one-to-one correspondence with the one or more radial probes.

9. The eddy current sensor for a rotary shaft according to claim 1 , wherein the one or more position detecting probes comprise one or more axial probes that are provided on the middle portion, and wherein detecting ends of the one or more axial probes are oriented parallel to an axial direction of the central hole, the axial probes are configured to determine a axial distance between an outer surface of the rotary shaft and the axial probes.

10. The eddy current sensor for a rotary shaft according to claim 1 , further comprising a compensating probe disposed on the housing, wherein the compensation probe is for detecting impacts of an external environment on the eddy current sensor, the external environment includes at least one of external environment temperature, humidity, and external force deformation, wherein data detected by the position detecting probes or the rotating speed detecting probe is compensated based on the data detected by the compensating probe.

11. A rotary shaft apparatus, comprising a rotary shaft having an eddy current sensor according to claim 1 , the housing of the eddy current sensor being disposed around the rotary shaft; one or more rotating speed detection exciting portions being provided on the rotary shaft; the rotating speed detecting probe of the eddy current sensor being provided in correspondence to a revolving plane of the one or more rotating speed detection exciting portions.

12. The rotary shaft apparatus according to claim 11 , wherein the one or more rotating speed detection exciting portions is provided on a peripheral outer surface of the rotary shaft, a detecting end of the rotating speed detecting probe being oriented perpendicular to an axial direction of the rotary shaft.

13. The rotary shaft apparatus according to claim 11 , wherein the rotary shaft comprises a flange, the one or more rotating speed detection exciting portions being provided on an axial end of the flange, a detecting end of the rotating speed detecting probe being oriented parallel to an axial direction of the rotary shaft.

Assignees

• Gree Green Refrigeration Tech Ct Co Ltd Zhuhai

Inventors

• Huang Weicai
• Hu Yusheng
• Geng Jiqing
• Liu Zhichang

Classifications

• G01P3/495 Primary

  where the indicating means responds to forces produced by the eddy currents and the generating magnetic field · CPC title

• G01P3/49

  using eddy currents · CPC title

• F16C3/02

  Shafts; Axles · CPC title

• G01B7/003

  for measuring position, not involving coordinate determination (coordinate measuring G01B7/004) · CPC title

• G01P3/484

  delivered by contact-making switches · CPC title